Quote Originally Posted by ath View Post
Sometime ago (before I had Cteins book) I read that prints on VC paper might be not really sharp because of the sensitivity to UV. I made a simple test: raise the head as far as possible (resulting in a mag. of 17), make a print with and without UV filter. Guess what - no difference visible (EL Nikkor N 50/2.8), case closed.
That's because tungsten lamps (including halogen) emit virtually no energy in the UV portion of the spectrum.

If you used direct unfiltered sunlight as the light source for your enlarger, you might notice a difference.

- Leigh